Free betting calculator
Kelly Criterion Calculator
Enter your bankroll, the American odds and your estimated win probability to get the stake that maximises long-term bankroll growth.
Money set aside for betting
Implied probability 45.45%
Adjust if your estimate differs
Recommended stake
$83.33
Full Kelly on a $1,000.00 bankroll
- Share of bankroll
- 8.33%
- Half Kelly
- $41.67
- A common, lower-variance choice
- Quarter Kelly
- $20.83
How it works
The Kelly criterion stakes a fraction of your bankroll proportional to your edge. Bet more when your edge is large relative to the payout, and nothing when there is no edge.
Full Kelly assumes your probability is exactly right, which it rarely is. Many bettors stake half or a quarter of the Kelly amount to cut the swings.
b = decimal odds − 1 p = win probability q = 1 − p
f* = (b × p − q) / b
stake = max(0, f* × bankroll)
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